HP M880 66.60.50 stapler stacker error

[Lasersupplies]

Recently a few of our clients have been getting this issue when printing out booklets. I have tried HP's fix with no success.

"1. Make sure that the finisher is properly grounded. 2. Ensure that the finisher is latched and locked to the engine by tightening the thumbscrew inside the front door. 3. Ensure that the grounding-frame assembly (the bar with the wheel located between the engine and the finisher) is in the down position with the wheel touching the floor"


Has anyone else encountered this issue?
Thanks in advance

[ninja_unmatched]

What fix did you do?

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[Lasersupplies]

we have tried all of the solutions above with no joy, have swapped the stapler unit also and still the same. will happen intermittently roughly every 7/8 booklets which makes it harder to pinpoint the issue.